句子翻译 (满分10分)

1 能否借助于克隆手段使一些已灭绝的动物复活呢？

Is it possible to restore some extinct animals _____ _________ _____ cloning?

2 我们和村民们握手告别。

We _______ _________ _________all the villagers and said goodbye to them.

3 这些年轻的志愿者时不时地到福利院帮忙。

The young volunteers go to help in the welfare house________ _______ ______.

4 从空中看，地球是个有几块陆地突出水面的水球。

Seen from the sky, the earth is a water ball with a few pieces of land ______ _____ ______ water.

5 他们很沮丧，因为所有的努力都徒劳无益.

They were so ________ ________because all attempts were ______ _________.

6 网购时当心被虚假广告信息蒙骗而上当。

Be careful not to be _______ _____by false advertisements while shopping online.

7 他的努力与坚持不懈得到回报，他考上了北京大学。

His efforts and perseverance_______ ______ when he was admitted into Beijing University.

甲同学将耳朵贴在一根长铁管的一端，乙同学在另一端用力敲一下铁管，甲同学能听到（　　）

A．1次敲击声

B．2次敲击声

C．3次敲击声

D．4次敲击声